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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
17 December 2012 to 14 March 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes
Type of method:
thermal analysis
Melting / freezing pt.:
> 150 °C
Atm. press.:
ca. 1 013 hPa
Decomposition:
yes
Decomp. temp.:
150 °C

Thermal stability and decomposition point by DTA/DSC
At ambient temperature the test item is solid.
An exothermal effect starting at approx. 150 °C could be interpreted as decomposition
of the test item.


Melting point by DTA / DSC
The detected exothermic reaction led to an endothermic effect which could be interpreted as melting process (approx.152 °C and approx.167 °C).
The melting process was found to be not reversible. After cooling down a one-time melted sample the melting point could not be detected anymore

Conclusions:
The test substance decomposes before melting.
Executive summary:

The sample is closed up in a crucible made of aluminium and heated up in a DTA/DSC-system to 120°C. Then the sample was heated up to 200°C (heating rate 1 K/min). In comparison with an inert sample (empty crucible) the temperature difference and the heat effect are recorded.

An exothermal effect starting at approx. 150°C could be interpreted as decomposition of the test item. The detected exothermic reaction led to an endothermic effect which could be interpreted as melting process of the artifact resulting from the decomposition process (approx.152°C and approx.167°C). The melting process was found to be not reversible. After cooling down a one-time melted sample the melting point could not be detected anymore.

Description of key information

Substance decomposes prior to melting.

Key value for chemical safety assessment

Additional information

No melting point up to 450°C. The test substance decomposes before melting.